Retire unused memcheck suppressions. HttpServerPropertiesManager code

has changed a lot recently (we update/persist only if things change etc).

Retire from tools/valgrind/memcheck/suppressions.txt any bug suppressions
that we have no known occurrences for in
http://chromium-build-logs.appspot.com/suppression_query?suppression_query=HttpServerPropertiesManager

BUG=288804
R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1252973007

Cr-Commit-Position: refs/heads/master@{#341637}